/*header*/
.header {
    width: 100%;
    height: 60px;
    position: fixed;
    z-index: 10;
    background-color:rgba(0, 0, 0, .1);
}
.header__logo {
    width: 150px;
    height: 60px;
    line-height: 60px;
    background: url(../img/logo.png) no-repeat left center;
    color: #fff;
    font-size: 18px;
    font-weight: bolder;
    text-indent: 50px;
    position: absolute;
    top: 50%;
    margin-top: -30px;
    left: 10px;
    cursor: pointer;
}
.header__nav {
    position: absolute;
    height: 60px;
    right: 0;
    top: 50%;
    margin-top: -30px;
    margin-right: 30px;
    color: #fff;
    font-size: 0; /*inline-block，除去空隙*/
}
.header__nav__item {
    width: 600px;
    height: 60px;
    line-height: 60px;
    padding: 0 20px;
    color: #fff;
    font-size: 14px;
    text-align: center;
    position: relative;
}
.header__nav__item:hover {
    color: #fff;
}
.header__nav__item_status_active{
	color: #fff;
}

.header__nav__item_study_btn {
    width: 96px;
    height: 40px;
    line-height: 40px;
    border-radius: 5px;
    background: #f00;
    text-align: center;
    padding: 10px 20px;
    color: #fff;
}
.header__nav__item_study_btn:hover {
    box-shadow: 0 0 5px 2px rgba(0, 0, 0, .3);
}
.header__nav__tip {
    width: 56px;
    height: 2px;
    background-color: #f00;
    position: absolute;
    top: 53px;
    left: 0;
	/* bottom: 0px; */
    margin-left: 20px;
    transition: all .5s;
}

/*screen-1*/
.screen-1 {
    width: 100%;
    height: 640px;
    position: relative;
}
.screen-1__title {
    font-size: 42px;
    color: #fff;
    text-align: center;
    font-weight: bolder;
    position: absolute;
    top: 239px;
    left: 50%;
    transform: translateX(-50%);
}
.screen-1__subtitle {
    font-size: 16px;
    color: #fff;
    text-align: center;
    position: absolute;
    top: 314px;
    left: 50%;
    transform: translateX(-50%);
}
.screen-1__bg {
    width: 100%;
    height: 640px;
    background: url(../img/sc1.jpg) no-repeat ;
    background-size: cover;
    position: absolute;
    left: 0;
    z-index: -1;
}

/*screen-2*/
.screen-2 {
    height: 640px;
    background: #fff;
    overflow: hidden;
    position: relative;
}
.screen-2__title {
    text-align: center;
    font-size: 43px;
    font-weight: bolder;
    margin-top: 88px;
}
.screen-2__line {
    height: 3px;
    width: 49px;
    margin-top: 34px;
    background: #f00;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}
.screen-2__subtitle {
    text-align: center;
    font-size: 15px;
    line-height: 21px;
    margin-top: 56px;
}
.screen-2__bg {
    height: 362px;
    width: 682px;
    position: absolute;
    left: 50%;
    bottom: -27px;
    margin-left: -341px;
    background: url(../img/sc2.png) no-repeat center;
    background-size: cover;
    z-index: 1;
}
.screen-2__bg-1 {
    height: 380px;
    width: 275px;
    position: absolute;
    left: 50%;
    margin-left: -138px;
    bottom: 0;
    background: url(../img/sc2-1.png) no-repeat center;
    background-size: cover;
    z-index: 3;
}
.screen-2__bg-2 {
    height: 205px;
    width: 266px;
    position: absolute;
    right: 106px;
    top: 57px;
    background: url(../img/sc2-2.png) no-repeat left top;
}

/*screen-3*/
.screen-3 {
    height: 640px;
    background-color: #2b333b;
    overflow: hidden;
    position: relative;
}
.screen-3__bg-wrap {
    width: 50%;
    height: 640px;
    position: absolute;
    left: 0;
}
.screen-3__bg {
    width: 308px;
    height: 640px;
    background: url(../img/sc3.png) no-repeat left;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background-size: contain;
}
.screen-3__wrap {
    width: 50%;
    height: 390px;
    color: #fff;
    position: absolute;
    top: 220px;
    left: 50%;
}
.screen-3__title {
    font-size: 34px;
}
.screen-3__line {
    width: 50px;
    height: 3px;
    background-color: #f00;
    margin: 20px 0;
}
.screen-3__subtitle {
    font-size: 14px;
    line-height: 20px;
}
.screen-3__language {
    width: 620px;
    height: 70px;
    position: absolute;
    top: 300px;
}
.screen-3__language__item {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: inline-block;
    text-align: center;
    line-height: 60px;
    font-size: 14px;
    font-weight: bolder;
    margin: 0 17px;
}
.screen-3__language__html {
    border: 4px solid #1f5975;
    color:  #108590;
}
.screen-3__language__php {
    border: 4px solid #424d76;
    color:  #4f7dfd;
}
.screen-3__language__java {
    border: 4px solid #6b4146;
    color:  #ff584c;
}
.screen-3__language__python {
    border: 4px solid #29535f;
    color:  #249d85;
}
.screen-3__language__nodejs {
    border: 4px solid #3e4e40;
    color:  #909e41;
}

/*screen-4*/
.screen-4 {
    height: 640px;
    background-color: #fff;
    overflow: hidden;
    position: relative;
}
.screen-4__title {
    text-align: center;
    font-size: 41px;
    font-weight: bolder;
    color: #07111b;
    margin-top: 85px;
}
.screen-4__line {
    width: 50px;
    height: 4px;
    background: #f00;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 165px;
}
.screen-4__subtitle {
    text-align: center;
    font-size: 14px;
    color: #07111b;
    margin-top: 38px;
}
.screen-4__wrap {
    width: 1200px;
    height: 130px;
    position: absolute;
    left: 50%;
    top: 50%;
    font-size: 0;
    transform: translate(-50%,-50%);
}
.screen-4__item {
    width: 25%;
    display: inline-block;
    text-align: center;
}
.screen-4__item__i-1 {
    width: 80px;
    height: 70px;
    background: url(../img/sc4-1.png) no-repeat center;
    display: inline-block;
}
.screen-4__item__i-2 {
    width: 80px;
    height: 75px;
    background: url(../img/sc4-2.png) no-repeat center;
    display: inline-block;
}
.screen-4__item__i-3 {
    width: 80px;
    height: 75px;
    background: url(../img/sc4-3.png) no-repeat center;
    display: inline-block;
}
.screen-4__item__i-4 {
    width: 80px;
    height: 80px;
    background: url(../img/sc4-4.png) no-repeat center;
    display: inline-block;
}
.screen-4__item__text {
    font-size: 15px;
}


/*screen-5*/
.screen-5 {
    height: 640px;
    background: url(../img/sc5.jpg) no-repeat ;
    background-size: cover;
    overflow: hidden;
    position: relative;
}
.screen-5__bg {
    width: 200px;
    height: 200px;
    background: url(../img/sc5-1.png) no-repeat center;
    position: absolute;
    left: 50%;
    margin-left: -100px;
    top: 98px;
}
.screen-5__title {
    text-align: center;
    font-size: 45px;
    font-weight: bolder;
    margin-top: 350px;
    color: #fff;
}
.screen-5__line {
    width: 50px;
    height: 4px;
    background: #fff;
    position: absolute;
    left: 50%;
    margin-left: -25px;
    top: 430px;
}
.screen-5__subtitle {
    text-align: center;
    font-size: 16px;
    color: #fff;
    margin-top: 60px;
}

/*继续学习*/
.screen-6 {
    height: 200px;
    background: #fff;
    position: relative;
}
.screen-6__study_btn {
    width: 240px;
    height: 60px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-top: -30px;
    margin-left: -120px;
    border: 1px solid #707070;
    color: #14191e;
    border-radius: 5px;
    font-size: 20px;
    line-height: 60px;
    text-align: center;
    cursor: pointer;
}
.screen-6__study_btn:hover {
    color: #f00;
    border: 1px solid #f00;
    transition: all .1s;
}

/*footer*/
.footer {
    width: 100%;
    height: 100px;
    background: #000;
    color: #fff;
    display: table;
}
.footer__wrap {
    width: 100%;
    display: table-cell;
    vertical-align: middle;
    text-align: center;
}
.footer__list {
    font-size: 0;
    text-align: center;
}
.footer__item {
    font-size: 12px;
    display: inline-block;
    text-align: center;
    padding: 0 15px;
    cursor: pointer;
}
.footer__item:hover {
    color: #f00;
}
.footer__rights {
    text-align: center;
    padding-top: 12px;
}
.footer__rights-text {
    text-align: center;
    font-size: 14px;
    color: #787d82;
    display: inline-block;
    text-indent: 4em;
}

/*大纲样式*/
.outline {
    position: fixed;
    padding: 5px 10px;
    bottom: 120px;
    right: 0;
    background-color: #fff;
    box-shadow: 0px 4px 12px 0px rgba(7, 17, 27, 0.1);
    z-index: 3;
}

.outline__item {
    display: block;
    width: 40px;
    height: 30px;
    line-height: 30px;
    padding: 5px 0;
    background: rgb(255,255,255);
    margin: 5px 0px 0px;
    border-top: 1px solid #eee;
    text-align: center;
    color: #93999f;
}
.outline__item:first-child{
    border:none;
}
.outline__item:hover,
.outline__item_status_active{
    color: #f00;
}
